%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/enumerate.array {
    1 dict begin
    /a exch def
    [
      0 1 a length 1 sub {
          [ exch dup a exch get ]
      } for
    ]
    end
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/a2s {
    2 dict begin
    /i exch def
    i length dup string /o exch def
    1 sub 0 exch 1 exch {
        dup i 3 -1 roll get o 3 1 roll put
    } for
    o
    end
} bind def

/filter { % array proc(bool) -> array
    1 dict begin
    /p exch def
    [ exch
      {
          dup p not
          {
              pop
          } if
      } forall
    ]
    end
} bind def

/s2a {
    [ exch { } forall ]
} bind def


% end included library code

/formatstring {
    0 dict begin
    /n exch def
    s2a { 16#2D ne } filter /p exch def
    /r p length n mod def
    r 0 eq {
        /r r n add def
    } if
    [
        p enumerate.array {
            aload pop
            /c exch def
            /i exch def
            r i eq {
                16#2D
                /r r n add def
            } if
            c
        } forall
    ]
    a2s
    end
} bind def

(formatstring) test.start
(ABC-D-E-F) 3 formatstring (ABC-DEF) eq test
(A-BC-D-E) 2 formatstring (A-BC-DE) eq test
(-A-B-CD-E) 4 formatstring (A-BCDE) eq test
test.end